CVE-2026-15957
Published:July 21, 2026
Updated:August 06, 2026
Smithy-RS is a Rust code generation and runtime framework that generates HTTP clients and servers from Smithy interface definitions, powering the AWS SDK for Rust and custom service implementations.
Uncontrolled recursion in the JSON, CBOR, and XML deserializer functions emitted by Amazon smithy-rs code generation could allow remote attackers to cause a denial of service (process abort via stack exhaustion) via a small request containing deeply nested data for a recursive model shape to a generated SDK or server.
To mitigate this issue, users should upgrade to aws-sdk-rust release-2026-06-02 or later. Users building custom servers with smithy-rs codegen should regenerate from smithy-rs release-2026-06-01 or later.
Affected Packages
aws-smithy-cbor (RUST):
Affected version(s) >=0.0.1 <0.61.9Fix Suggestion:
Update to version 0.61.9aws-smithy-json (RUST):
Affected version(s) >=0.27.0-alpha <0.62.7Fix Suggestion:
Update to version 0.62.7aws-smithy-xml (RUST):
Affected version(s) >=0.27.0-alpha <0.60.15Fix Suggestion:
Update to version 0.60.15aws-smithy-types (RUST):
Affected version(s) >=0.27.0-alpha <1.4.9Fix Suggestion:
Update to version 1.4.9Related Resources (5)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Allocation of Resources Without Limits or Throttling
EPSS
Base Score:
0.42